Re: [CAD_CAM_EDM_DRO] Re: Guides

----- Original Message -----
From: Ross <rrcarl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, May 13, 2003 8:06 PM
Subject: [CAD_CAM_EDM_DRO] Re: Guides


> I couldn't find precision linear slides at a decent price either. I
thought for sure this thread would turn up a low cost source. I deal mainly
with MSC. They have linear bearings, but they don't give them away.
>
> I ended up making my own linear slides using 1/4 bore sealed ball
bearings. The tracks are plain old angle iron. It took some doing to get
the angle perfectly flat on the bearing surface, but I got it to within .002
on the Z height from table corner to table corner on a 5 foot table. If I
did it again, I would make the rails out of cold rolled steel flat stock.
>
> My lead screws are all chain driven with #35 chain. The machine runs
basically all the time and I have not seen any problems yet. It's longest
continuous run was 42 hours. The repeatability is quite good. I can go
from one end of the table to the other, then back again and there is no
noticable misalignment.
>
> I wanted to go with timing belt drive on the lead screws, but I couldn't
find the right length belts for the X axis, so I went with chain.
>
> Ross
>
>
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